import React, { Component } from 'react'
import './index.css'

export default class Item extends Component {

  state = {mouse:false}

  //鼠标移入移除的回调问题
  handleMouse = (flag) => {
     return () => {
      this.setState({mouse:flag})
    }
  }

  //勾选和取消勾选某一个todo的回调
  handleCheck = (id) => {
    return (event) => {
       this.props.updateTodo(id,event.target.checked)
    }
  }

  handleDelete = (id) => {
    if(window.confirm('确定删除吗?')){
      this.props.deleteTodo(id)
    }
  }


  render() {
    const {id,name,done} = this.props
    const {mouse} = this.state

    return (
        <li style={{backgroundColor:mouse ? '#ddd':'white'}} onMouseLeave={this.handleMouse(false)} onMouseEnter={this.handleMouse(true)}>
            <label>
                <input type="checkbox" checked={done} onChange={this.handleCheck(id)}/>
                <span>{name}</span>
            </label>
            <button onClick={()=> this.handleDelete(id)} className="btn btn-danger" style={{display: mouse ? 'block' : 'none'}}>删除</button>
        </li>
    )
  }
}
